Evaluate the following SQL statement:

SELECT
promo_id, promo_category

FROM promotions

WHERE promo_category
= ‘Internet’ ORDER BY promo_id

UNION

SELECT
promo_id, promo_category

FROM promotions

WHERE
promo_category = ‘TV’

UNION

SELECT
promo_id, promo_category

FROM promotions

WHERE
promo_category = ‘Radio’;

Which statement is true
regarding the outcome of the above query?

Question

Evaluate the following SQL statement:

SELECT
promo_id, promo_category

FROM promotions

WHERE promo_category
= ‘Internet’ ORDER BY promo_id

UNION

SELECT
promo_id, promo_category

FROM promotions

WHERE
promo_category = ‘TV’

UNION

SELECT
promo_id, promo_category

FROM promotions

WHERE
promo_category = ‘Radio’;

Which statement is true
regarding the outcome of the above query?

Answer

It executes successfully but ignores the order by clause because it is not located at the end of the compound statement.

Answer

It produces
an error because positional notation cannot be used in the order by clause with
separators.

Answer

It produces an error because the order by clause should appear only at the end of a compound query-that is, with the last select statement.

Answer

It executes
successfully and displays rows in the descending order of PROMO_CATEGORY.

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